Manufacture of brake linings



v1=eb.29,1944.' A R. A; @Gam-CH 2,342,933-

MANUFACTURE 0F BRAKE LINING Filed March 21, 1940 INV EN TOR.`

waz/WA B Y v un ATTORNEY.

ample:

Patented Feb. 29, 1944 UNITED STATES PATENT OFFICE MANUFACTURE F BRAKE LININGS Rudolph A. Goepfrich, south Bend, Ind., assignmto Bendix Aviation Corporation, South Bend,

Ind., a corporation of Delaware Application March 21, 1940, serial No. 325,153

2 Claims. (C

This invention relates tothe manufacture of brake linings or the like, suitable forexample for l facing brake shoes.

An object of the invention is to provide a lining for a brake shoe, having different characteristics at its opposite ends, for example being harder and slower-wearing at .one end than at the other.

Such a lining section can be used, in some cases,

1 vational views of lining being manufactured ,ac-

cording to my novel manufacturing method; and y Figure 3 is a diagrammatic plan view showing the cutting of my novel lining sections.

My novel manufacturing method may be carried out .in a standard extruding machine having two hoppers' I0 and I2 containing material for the manufacture of brake lining. One hopper contains material of a formula giving a hard, long-wearing lining, as for ex- The other hopper contains material of a formula giving a soft lining having the characteristic o wearing faster, for example:

Iron oxide pounds-- 42 Baryrtes do 42 Mineral rubber E do 6 Asbestos ilber -do 133 Solvent do 122 The material is extruded under pressure, in the usual manner, to form ribbons I4 and I6, side by side, and while still plastic these ribbons are pressed sidewise together in any desired manner to cause them to join edge to edge to-form a single ribbon I8 having a width equal to the length of the sections to be formed.

Sections are then cut crosswise from the ribbon I8, and are formed and cured under heat and pressure in the usual way.

This gives lining sections having lthe desired different characteristics at their opposite ends.

While particular formulas have been given, it is not my intention to limit the scopeof the'invention to those formulas, or otherwise than by the terms of the appended claims. Y'

I claim:

1. That method of making brake linings or the like comprising forming side by side two ribbons of lining material of different characteristics,

Ajoining said ribbons edge to edge to form a single strip having a width equal to the desired length o1 the finished brake lining, and then severing lining sections transversely of the Joined ribbons at intervalsequal to the desired width' of the finished brake lining, each section' thereby being of diiferent' characteristics at its opposite ends.

2. vThat method of making brake linings or the v 'like comprising forming side by side two ribbons of lining material, one' of a formula to give relatively long wear and the other oi a formula giving' shorter wear, joining said ribbons edge to edge to form a single strip having 'a width equal to the desired length of the finished brake lining, and then severing lining sections transversely of vthe Joined ribbons at intervals equal to the 4.5 desired width of the finished brake lining,

each section thereby being of different wear characteristics at its oppositev ends.

RUDOLPH A. GOEPFRI'CH.

Rubber -pounds-- 40 Sulphur ounces 13 Altax do 413 Tuads do 9 Age Rite do' l13 50 

